davidgriffin2019 Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 07:39:13 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/b-mode-simulation-create-a-region-of-small-spheres#post-7728 Thu, 06 Aug 2020 08:59:46 +0000 david.griffin.2019 7728@http://www.k-wave.org/forum/ <p>Hi Brad,</p> <p>This is exactly what I have done and it has worked quite well!<br /> Thank you for getting back to me.</p> <p>Kind regards,</p> <p>David </p> http://www.k-wave.org/forum/topic/b-mode-simulation-create-a-region-of-small-spheres#post-7725 Wed, 05 Aug 2020 20:25:42 +0000 Bradley Treeby 7725@http://www.k-wave.org/forum/ <p>Hi David,</p> <p>There are lots of ways. One would be to use <code>randi</code> to generate the x, y, and z grid indices for the centre of each sphere, and again for the radius. Pass these values to <code>makeBall</code>, and then use the ball mask to modify the background sound speed and density. Then call this in a loop for as many times as you need spheres. If you want to place them in a cubic region, just restrict the range of indices when you call <code>randi</code>.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/b-mode-simulation-create-a-region-of-small-spheres#post-7687 Sat, 04 Jul 2020 12:05:22 +0000 david.griffin.2019 7687@http://www.k-wave.org/forum/ <p>Hello,</p> <p>I hope you can help me.<br /> I'm new to K-wave (and MATLAB until relatively recently).</p> <p>As part of a university project I am attempting to create a simulated B-mode image of a tissue mass with a spherical tumour within it. </p> <p>To distinguish the tumour from the bulk tissue, I plan to use Effective Scatterer Diameter (ESD) as a distinguishing parameter, and see over a range of values what difference in ESD is required between the bulk tissue and tumour in order to identify the tumour on a B-mode image. </p> <p>I am attempting to modify the "Simulating B-mode Ultrasound Images Example" for my purposes.<br /> I wish to replace the three spheres with one spherical (or cubic) region which contains a number of smaller spheres (representing my effective scatterers). The diameter of these smaller spheres will vary over a small range, as will their speed of sound values (just like the three spheres in the example currently do). </p> <p>Can you suggest how I might create this mass of spheres?</p> <p>Any help at all would be much appreciated!</p> <p>Thank you,</p> <p>David </p>